Background: Patients with Parkinson disease (PD) and their partners report deterioration in their sexual life. Sexual dysfunction (SD), an important and often ignored aspect, is common in PD. Motor and nonmotor symptoms are involved in limiting pleasure and disturbing function. Sexual dissatisfaction is more common in men that in women. Frequently, both patients and partners have SD associated with PD, and both need suitable treatment. These issues need to be evaluated by neurologists or PD nurses and by specialized sex therapists. The objectives of this study were to describe the complexity and multidimensional nature of sexual problems in PD, enable practitioners to assess and treat sexual difficulties of their patients, and increase awareness of the role of sex therapy in the therapeutic process of PD. Methods: Based on clinical experience of over 30 years in movement disorder clinics and a review of the literature, the authors suggest practical approaches, including an "Open Sexual Communication" module, prescribing medications, and/or referring to specialists. Results and Discussion: The longitudinal nature of treating neurologic patients puts physicians in an important position to introduce sexual issues and to assess and plan the interventions and follow-up needed to ensure that sexual difficulties are resolved. The management of hypersexuality requires a thoughtful distinction between lack of opportunities for sexual expression, limited ability to perform, and true hypersexuality. Sex therapists have a major role in the assessment and treatment of the multiple factors that may underlie sexual dissatisfaction in PD, differentiating between hypersexual behaviors and other sexual preoccupation behaviors, and training the professional team.Parkinson's disease (PD) is an age-related, chronic, multisystem, progressive disorder with motor symptoms (bradykinesia, rigidity, tremor, and postural instability) 1 and highly prevalent and diverse nonmotor symptoms (NMS), which can precede the motor symptoms and may have a significant, adverse impact on quality of life (QoL). 2 NMS also contribute to caregiver strain and depression even more than motor symptoms. 3 NMS can be divided into 4 domains: (1) neuropsychiatric (e.g., depression, anxiety, apathy, dementia), (2) autonomic (e.g., constipation, orthostatic hypotension, urinary disturbances, and erectile dysfunction [ED]), (3) sleep-related (e.g., insomnia, excessive daytime sleepiness, restless-legs syndrome), and (4) sensory dysfunction (e.g., pain and changes in smell, vision, and olfaction). 2 The motor symptoms and NMS progress over time with growing physical disability and may contribute to sexual dysfunction (SD). 4 Sexual functioning is a multifaceted process that requires coordinated functioning of the person's mental, autonomic, sensory, and motor systems and depends on proper function of the neurologic, vascular, and endocrine systems, allowing sufficient blood supply to and from genital organs, a balanced hormonal system, and a healthy emotion...